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    Wyświetlanie 1-5 z 5
    Tytuł:
    Analysis of Interference Signals Generated by Vibroacoustic Vibrations of Transformer Cores
    Autorzy:
    Boczar, T.
    Borucki, S.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199078.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Bm
    42.79.Pw
    52.80.Hc
    Opis:
    The article deals with the subject matter referring to the interference that may accompany measurements of vibroacoustic signals, generated by electric power transformers, taken by using the acoustic emission method under industrial conditions. Paper concerns measurement and analysis of internal, acoustic type disturbances, including the magnetostrictive vibrations of plate sets within the transformer core, caused by changes in the magnetic flux. Paper presents measurement results of acoustic interfering signals and results of analyses made in the frequency and time-frequency domains. Power spectral density, MUSIC pseudospectra, two- and three-dimensional short time Fourier transform spectrograms, continuous wavelet transform scalograms, discrete wavelet transform, and quantities of energy transferred are included in the paper.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1355-1359
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Optical Radiation Generated by Partial Discharges on Insulators
    Autorzy:
    Frącz, P.
    Boczar, T.
    Borucki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366318.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Bm
    42.79.Pw
    52.80.Hc
    Opis:
    Results of measurements of optical radiation emitted by partial and complete electrical discharges occurring on a bushing insulator model placed in air are presented in the article. Registration was performed using a spectrophotometer, enabling for measurement of optical radiation in the range from 270 to 1700 nm. Detailed characteristics of spectrophotometer are presented in our previous paper. The primary objective of the laboratory tests was to evaluate the impact of supply voltage changes in the range from 0 to 0.99 $U_{b}$ (breakdown voltage) on the intensity and spectral character of the optical radiation emitted by partial discharges generated on the porcelain insulation surface of the bushing insulator. In the scope of studies analyzes of the effects of voltage changes on the obtained spectral waveforms were performed, whereby voltage increase and reduction was examined separately. Additionally, measurements and analyzes carried out included impact estimation of the time period as the voltage was applied to the high-voltage electrodes on the course of optical phenomena related to the generation of partial discharges.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1360-1366
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Results of Optical Signals Analyses Emitted by Electrical Discharges Recorded with UV Camera
    Autorzy:
    Frącz, P.
    Boczar, T.
    Borucki, S.
    Cichoń, A.
    Zmarzły, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417952.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Bm
    42.79.Pw
    52.80.Hc
    Opis:
    In the article results of measurements and analyses of the optical signals emitted by electrical surface partial discharges occurring on bushing and post insulators, recorded with UV camera during tests under laboratory conditions are presented. The carried out research was to determine the effect of the distance between the insulator's electrodes and the voltage value on the number of partial discharges.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 814-817
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of Surface Partial Discharges Measured with Ultraviolet Camera
    Autorzy:
    Frącz, P.
    Zmarzły, D.
    Boczar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398747.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.79.Pw
    79.60.Bm
    52.80.Hc
    Opis:
    The performed research works consider diagnosis of different models of support and bushing insulators. Insulator systems undergo aging processes, which causes deterioration of the insulating properties. In addition, pollutants that accumulate on the surface of high voltage insulators cause further reduction of the insulation properties. Presence of pollutants and high humidity level cause formation of conductive paths, which acts as a source of partial discharges. Presented results depict optical signals, recorded by ultraviolet camera, which were emitted by surface partial discharges occurring on different insulator models. In particular, the effect of the relative value of camera sensitivity on the number of surface partial discharges counts was evaluated. In addition, analysis of the effect of the surface partial discharges generation time on registered counts number was made. The experiments were performed at a constant voltage of $0.9U_{p}$ and for a distance between the HV electrode and GND equal to 10 cm. The experimental study lasted over a period of 30 min, while the measurement steps were done every minute.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 715-718
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Optical Radiation Generated by Electrical Discharges on Support Insulator
    Autorzy:
    Frącz, P.
    Boczar, T.
    Zmarzły, D.
    Szczyrba, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399341.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Bm
    42.79.Pw
    52.80.Hc
    Opis:
    Subject of the paper concerns determination of the feasibility and indication of the application scope of optical spectroscopy methods in the diagnosis of high-voltage insulators. Results of measurements of optical radiation emitted by partial and complete electrical discharges occurring on a support insulator model placed in air are presented in the paper. Registration was performed using a spectrophotometer, enabling for measurement of optical radiation in the range from 200 to 1800 nm. The primary objective of the laboratory tests was to evaluate the impact of supply voltage changes in the range from 0 to 60 kV on the intensity and spectral character of the optical radiation emitted by electric discharges generated on the porcelain insulation surface of the support insulator. In the scope of studies analyzes of the effects of voltage changes on the obtained spectral wave forms were performed, whereby voltage increase and reduction was examined separately. Additionally, measurements and analyzes carried out included impact estimation of the time period as the voltage was applied to the high-voltage electrodes on the course of optical phenomena related to the generation of electrical discharges.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 413-416
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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